Stink bugs could injure corn in addition to soybeans
Field crop growers might already be aware that stink bugs could cause injury to soybeans, but it seems the smelly pests could also cause problems for both sweet and field corn, say entomologists with Ohio State University's College of Food, Agricultural, and Environmental Sciences.
Although the damage stink bugs can cause to soybeans in Ohio has the potential to be a significant problem, fewer growers might be aware that the insects can also cause corn injury, said Andy Michel, an Ohio State University Extension pest expert.
While there have been few reports in the Buckeye state of stink bug damage in some northern Ohio corn fields, growers who have found discolored, shrunken or missing kernels, might find that stink bugs are indeed the culprit, said Michel, who also has an appointment with the Ohio Agricultural Research and Development Center.
Stink bugs, known for their "sweaty feet" smell when squashed or irritated, have made their way into Ohio soybean fields and now some Ohio corn fields, in addition to invading homes statewide, he said.
"The damage isn't really extensive but growers may see some damage on some kernels," Michel said. "Usually the damage in field corn is localized to scarring on kernels or causing a mottled appearance near the tip of the ear, but severe injury has also been observed.
"Sweet corn is particularly susceptible to stink bugs and exhibits similar damage characteristics."
Michel said damage reports have come in on some corn fields in Wood County and at Ohio State's Waterman Farm in Columbus. The damage to corn crops is mainly caused by green stink bugs, which are native to Ohio, he said. But some of the damage to corn was also caused by the brown marmorated stink bug, which is a fairly new pest to the region.
A native of eastern Asia, the brown marmorated stink bug was first identified in the U.S. in Allentown, Pa., in 2001, said Ron Hammond, an OSU Extension entomologist. The brown, three-quarter-inch-long insects are known to feed on a wide range of crops, including apples, peaches, tomatoes and soybeans.
Likewise, he said, sightings of larger-than-usual numbers of green stink bugs have also been reported in Ohio soybean fields, as well as reports of the red-shouldered stink bug, which is a newer pest in Ohio.
"Up until recently, stink bugs weren't in populations large enough to cause a concern in Ohio," Hammond said. "But as these bugs begin to increase in numbers across the state, the concern for soybean growers is the potential for yield declines due to the pests, which use their piercing-sucking mouthparts to feed on the plant seeds."
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